feat: 🧑‍💻 Add CLAUDE.md file for Claude Code (#102)

.gitignore

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 cspell.json
 
 tmp/*
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 # macOS system files
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+.worktrees/

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+DataHaven is an EVM-compatible Substrate blockchain secured by EigenLayer. It bridges Ethereum and Substrate ecosystems through:
+- EigenLayer AVS integration for security
+- Snowbridge for cross-chain communication
+- Frontier pallets for EVM compatibility
+- External validators with rewards system
+
+## Critical Development Commands
+
+### E2E Testing Environment (from `/test` directory)
+
+```bash
+# Setup
+bun i                               # Install dependencies
+bun cli                            # Interactive CLI for test environment
+
+# Code Quality
+bun fmt:fix                        # Fix TypeScript formatting
+bun typecheck                      # TypeScript type checking
+
+# Code Generation (run after contract changes)
+bun generate:wagmi                 # Generate TypeScript contract bindings
+bun generate:types                 # Generate Polkadot-API types from runtime
+
+# Local Development
+bun build:docker:operator          # Build local DataHaven Docker image
+bun start:e2e:local               # Launch local test network
+bun stop:e2e                      # Stop all test services
+
+# Testing
+bun test:e2e                      # Run E2E test suite
+```
+
+### Rust/Operator Development
+
+```bash
+cd operator
+cargo build --release --features fast-runtime    # Development build
+cargo test                                       # Run tests
+```
+
+### Smart Contracts (from `/contracts` directory)
+
+```bash
+forge build                        # Build contracts
+forge test                         # Run tests
+forge fmt                          # Format Solidity code
+```
+
+## Architecture Essentials
+
+### Cross-Component Dependencies
+- **Contracts → Operator**: DataHaven AVS contracts register operators and manage slashing
+- **Operator → Contracts**: Operator reads validator registry from contracts
+- **Test → Both**: E2E tests deploy contracts and run operator nodes
+- **Snowbridge**: Enables native token transfers and message passing between chains
+
+### Key Design Patterns
+1. **Service Manager Pattern**: Contracts use EigenLayer's service manager for operator coordination
+2. **Rewards Registry**: Tracks validator performance and distributes rewards
+3. **Slashing Mechanisms**: Enforces protocol rules through economic penalties
+4. **Runtime Upgrades**: Substrate's forkless upgrade system for protocol evolution
+
+### Testing Strategy
+- **Unit Tests**: In each component directory
+- **Integration Tests**: E2E tests in `/test` that spin up full networks
+- **Kurtosis**: Manages complex multi-container test environments
+- **Contract Verification**: Automated on Blockscout in test networks
+
+### Development Workflow
+1. Make changes to relevant component
+2. Run component-specific tests
+3. If changing contracts, regenerate TypeScript bindings
+4. Build Docker image if testing operator changes
+5. Run E2E tests to verify cross-component interactions
+
+### Common Pitfalls
+- Always regenerate types after runtime changes (`bun generate:types`)
+- E2E tests require Kurtosis engine running
+- Contract changes require regenerating Wagmi bindings
+- Snowbridge relayers need proper configuration for cross-chain tests
+- Use `fast-runtime` feature for quicker development cycles